Multi-Purpose Rail, length = 192mm (7.4 inches)
If using a Really Right Stuff B91 flash bracket with this lens, you will need to add our FB-A600 Raised Dovetail Adapter. This adapter mounts to the MPR-192 rail and raises the mounting location of the flash bracket by 6/10" of an inch to allow flash bracket to fully clear the barrel of the lens. See link under Related Items at left.
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